We review the present status of the Standard Model calculation of the anomalous magnetic
moment of the muon. This is performed in a perturbative expansion in the fine-structure …

We review the structure of Roy–Steiner equations for pion–nucleon scattering, the solution
for the partial waves of the t-channel process π π→ N ̄ N, as well as the high-accuracy …

We address the contribution of the 3 π channel to hadronic vacuum polarization (HVP) using
a dispersive representation of the e+ e−→ 3 π amplitude. This channel gives the second …

The super τ-charm facility (STCF) is an electron–positron collider proposed by the Chinese
particle physics community. It is designed to operate in a center-of-mass energy range from …

Puzzles in the determination of the hadronic-vacuum-polarization contribution currently
impede a conclusive interpretation of the precision measurement of the anomalous …

Decays of the neutral and long-lived η and η′ mesons provide a unique, flavor-conserving
laboratory to test low-energy Quantum Chromodynamics and search for new physics …

We consider the contribution of scalar resonances to hadronic light-by-light scattering in the
anomalous magnetic moment of the muon. While the f 0 (500) has already been addressed …

A bstract Isospin-breaking (IB) effects are required for an evaluation of hadronic vacuum
polarization at subpercent precision. While the dominant contributions arise from the e+ …

We study the reaction e^+ e^-→ π^ 0 γ e+ e-→ π 0 γ based on a dispersive representation of
the underlying π^ 0 → γ γ^* π 0→ γ γ∗ transition form factor. As a first application, we …

The last two decades have witnessed the discovery of a myriad of new and unexpected
hadrons. The future holds more surprises for us, thanks to new-generation experiments …